Refactor generated builder names in @babel/types (#11582)

* ensure only builders starting with lowercase are used

* update generate builders to have function name starting flow lowercase

* fix bug in deprecated builders

* remove comment about not yet discussed change in next major version

packages/babel-generator/test/index.js

@@ -463,32 +463,32 @@ describe("programmatic generation", function () {
 
   describe("typescript generate parentheses if necessary", function () {
     it("wraps around union for array", () => {
-      const typeStatement = t.TSArrayType(
-        t.TSUnionType([
-          t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
-          t.TSNullKeyword(),
+      const typeStatement = t.tsArrayType(
+        t.tsUnionType([
+          t.tsIntersectionType([t.tsNumberKeyword(), t.tsBooleanKeyword()]),
+          t.tsNullKeyword(),
         ]),
       );
       const output = generate(typeStatement).code;
       expect(output).toBe("((number & boolean) | null)[]");
     });
     it("wraps around intersection for array", () => {
-      const typeStatement = t.TSArrayType(
-        t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
+      const typeStatement = t.tsArrayType(
+        t.tsIntersectionType([t.tsNumberKeyword(), t.tsBooleanKeyword()]),
       );
       const output = generate(typeStatement).code;
       expect(output).toBe("(number & boolean)[]");
     });
     it("wraps around rest", () => {
       const typeStatement = t.tsRestType(
-        t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
+        t.tsIntersectionType([t.tsNumberKeyword(), t.tsBooleanKeyword()]),
       );
       const output = generate(typeStatement).code;
       expect(output).toBe("...(number & boolean)");
     });
     it("wraps around optional type", () => {
       const typeStatement = t.tsOptionalType(
-        t.TSIntersectionType([t.TSNumberKeyword(), t.TSBooleanKeyword()]),
+        t.tsIntersectionType([t.tsNumberKeyword(), t.tsBooleanKeyword()]),
       );
       const output = generate(typeStatement).code;
       expect(output).toBe("(number & boolean)?");

packages/babel-plugin-transform-typescript/test/fixtures/imports/parameter-decorators/plugin.js

@@ -25,7 +25,7 @@ exports.default = function(_ref) {
               .forEach(function(decorator) {
                 resultantDecorator = types.callExpression(
                   decorator.expression,
-                  [resultantDecorator || types.Identifier(paramUidName)]
+                  [resultantDecorator || types.identifier(paramUidName)]
                 );
               });
 
@@ -40,12 +40,12 @@ exports.default = function(_ref) {
                   "body",
                   types.variableDeclaration("var", [
                     types.variableDeclarator(
-                      types.Identifier(decoratedParamUidName),
+                      types.identifier(decoratedParamUidName),
                       resultantDecorator
                     ),
                   ])
                 );
-              param.replaceWith(types.Identifier(paramUidName));
+              param.replaceWith(types.identifier(paramUidName));
             }
           });
       },

packages/babel-types/scripts/generators/generateBuilders.js

@@ -11,15 +11,29 @@ module.exports = function generateBuilders() {
  */
 import builder from "../builder";\n\n`;
 
+  const reservedNames = new Set(["super", "import"]);
   Object.keys(definitions.BUILDER_KEYS).forEach(type => {
-    output += `export function ${type}(...args: Array<any>): Object { return builder("${type}", ...args); }
-export { ${type} as ${formatBuilderName(type)} };\n`;
+    const formatedBuilderName = formatBuilderName(type);
+    const formatedBuilderNameLocal = reservedNames.has(formatedBuilderName)
+      ? `_${formatedBuilderName}`
+      : formatedBuilderName;
+    output += `${
+      formatedBuilderNameLocal === formatedBuilderName ? "export " : ""
+    }function ${formatedBuilderNameLocal}(...args: Array<any>): Object { return builder("${type}", ...args); }\n`;
+    // This is needed for backwards compatibility.
+    // arrayExpression -> ArrayExpression
+    output += `export { ${formatedBuilderNameLocal} as ${type} };\n`;
+    if (formatedBuilderNameLocal !== formatedBuilderName) {
+      output += `export { ${formatedBuilderNameLocal} as ${formatedBuilderName} };\n`;
+    }
 
     // This is needed for backwards compatibility.
     // It should be removed in the next major version.
     // JSXIdentifier -> jSXIdentifier
     if (/^[A-Z]{2}/.test(type)) {
-      output += `export { ${type} as ${lowerFirst(type)} }\n`;
+      output += `export { ${formatedBuilderNameLocal} as ${lowerFirst(
+        type
+      )} }\n`;
     }
   });
 
@@ -27,7 +41,7 @@ export { ${type} as ${formatBuilderName(type)} };\n`;
     const newType = definitions.DEPRECATED_KEYS[type];
     output += `export function ${type}(...args: Array<any>): Object {
   console.trace("The node type ${type} has been renamed to ${newType}");
-  return ${type}("${type}", ...args);
+  return builder("${type}", ...args);
 }
 export { ${type} as ${formatBuilderName(type)} };\n`;
 

packages/babel-types/src/builders/typescript/createTSUnionType.js

@@ -1,4 +1,4 @@
-import { TSUnionType } from "../generated";
+import { tsUnionType } from "../generated";
 import removeTypeDuplicates from "../../modifications/typescript/removeTypeDuplicates";
 
 /**
@@ -14,6 +14,6 @@ export default function createTSUnionType(
   if (flattened.length === 1) {
     return flattened[0];
   } else {
-    return TSUnionType(flattened);
+    return tsUnionType(flattened);
   }
 }